Lifting-jack



Patented February 2, 1904.

PATENT OEEICE.

LEROY O. LANDER, OF LISABUELA, `W'ASHINGrTON.

-LlFTlNG-JACK.

SPECIFICATION forming -part of Letters Patent No. 751,309, datedFebruary 2, 1904.

' Application filed July/.25, 1903. SerialNo.166 .968. (No model.)

To all whom it, may concern: l

Be it known that I, LEROY O. LANDER, a citizen of the United States, anda resident of Lisabuela, in the conntyof King and State ofWashingtomhave invented anew and Improved Lifting-Jack, of which thefollowing is a full, clear, and exact description.

This invention relates to lifting-jacks; and

4 it consists, substantially in certain parts, and

details and combinations of the same, hereinafter particularlydescribed, and pointed out in' the claims. y

My improvements have referencemore especially to the type oflifting-jacks -of which the one shown and described in my former LettersPatent, No. 391,165, granted on the 16th day of October, 1886, is anexample; and one of the principal objects of my present invention is toprovide means for overcoming numerous disadvantages and objections foundto eXist with manyjacks of this kind hitherto devised, and also toprovide a jack which is simple in construction, strong and durable inuse, not liable to get out of order, and which is also comparativelyinexpensive to manufacture. I

'A further object of the invention is to provide a lifting-jack of thecharacter referred to which is effective and reliable in use, as well aseasily operated and controlled, besides possessing the capacity for longand repeated service. v

The above and additional objects are attained by means substantiallysuch as are illustrated in the accompanying drawings, forming a part ofthis specification, in which similar characters of referenceindicatecorresponding parts in all the figures.

Figure 1 is a perspective view of a liftingjack embodying myimprovements. Fig. 2 is a vertical view thereof; and Fig. 3 is also avertical sectional view in detail, showing the operation of thespring-actuated dog or detent for the lifting-bar.

1 of a pivoted operating-lever, the said liftingbar being automaticallycaught and retained in dierent vertical positionsl by means of a doghaving special means for operating the same, and while I have hereinrepresented my improvements in a certain preferred embodiment itwill. beunderstood, of course, that I am not'limited thereto in practice, sinceimmaterial changes thereinmay be resorted to coming within the scopeof'my invention.

Specific reference beinghad tothe accompanying drawings by thedesignating charac-l ters marked thereon, 1 represents ya stock having abase 2 and formed with avertical groove 3, between the sides of whichvworks the lifting-bar 4, provided on its inner vertical face with aseries of teeth or projections 5, as shown, and having at'its upper enda detachable head 6 and at its lower end an integral foot 7 designed tobe placed beneath a log or other devi/ce to lbe lifted by the structure.Secured to the upper part of the stock by means of bolts 8 are thecheek-pieces 9 of' a guide 10 for the lifting-bar, said cheek-piecesbeing connected by an additional bolt '11, swinging on which within theSaid cheek-pieces `are preferably duplicate links12, between the lowerends of which is .pivoted at 13 the inner end portion 14 of anoperating-lever 15,

which may be socketed at 16 for the insertion of a handle, (not shown,)the said end portion of the lever terminating 'in a toe 15, adapted tothe spaces between the said teeth 5, so as to engage the latter, asshown. i I have found it a decided advantage to thus organize the saidconnecting-links for .the lever, since the links are brought closer.,together, resulting in v'greater strength, besides rendering the sameless liable to breakage or injury from Contact with external objects, asis apparent, and,

moreover, any tendency to spreading of said IOO flat spring steel spring21, the lower end of which is secured to the front of the stock, itbeing noted that the member 17 is supported by and works between theedgesof straightsided slots 22, formed in the lower part of the saidcheek-pieces of the guide 10. At the outer side of one (or both) or'said cheek-pieces is a pin or screw 23, passing' through a slot 24 in ahand-lever 25, having thumb-piece 26, the lower end or' said hand-leverbeing pivoted at 27 to an end of the slidable slide member 17, and thusit will be seen that by proper manipulation of this hand-lever thelifting-bar may be caused to be released from engagement with the teethto enable lowering of the bar when desired.

The organization of the special form of aetuating-spring for the slidehas the advantage of greater strength with less liability to aceidentaloperation thereoiI in use, which would cause a release of thelifting-bar, which is a I disadvantage in many former lifting-jacks ofthis class. The upper end of said spring works against the shoulder onthe slide, and thus will the operation of my improvements be fullyunderstood.

Having thus described my invention, I claim as new and desire to secureby Letters Patent-a l. A lifting-jack comprising a stock having a guide,with slots therein, a lifting-bar working through the guide and providedwith a series of teeth, an operating-lever for the bar having means forengaging said teeth, a slide working through the stock, having ashoulder near its outer end, said slide having a member movable in saidslots and engaging said teeth to lock the bar, and a flat springoperating at one end against said shoulder and secured at its other endto said stock, said spring operating to hold said slide normally inengagement with the teeth.

2. A lifting-jack comprising a stock, having at its upper end anupwardly projecting guide, constructed with duplicate cheekpieces,having straight-sided slots therein, a lifting-bar working through theguide, the same having an integral foot, and provided on its inner facewith a series of teeth, an operating-lever for the bar, `having meansfor engaging' said teeth, a slide working through the stock, and havinga shoulder near its outer end, said slide having a member moving in saidslots, and engaging said teeth to lock the bar, a fiat spring operatingat one end. against said shoulder, and secured at its other end to thefront of the stock, and a slotted hand-lever for moving said slideoutwardly.

3. A lifting-jack comprising a stock, having at its upper part anupwardly projecting guide, Constructed with duplicate cheekpieees,having straight-sided slots therein, a lifting-bar working through theguide, the same having an integral foot, and provided on its inner facewith a series of teeth, an op erating-lever forthe bar, having a toe forengaging the teeth, links pivoted within the cheek-pieces, and havingmovable connection with the lever, a slide working through the steek,and provided with a shoulder near its outer end, said slide having amember moving in said slots, and engaging said teeth to lock the bar, aflat spring operating at one end against said shoulder, and secured atits other end to the stock, and a slotted hand-lever mounted at the sideof one of the cheekpieces, for disengaging the slide from said teeth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing 'witn esses.

' LEROY O. LANDER.

Witnesses:

JOHN TODD, WVM. O. DILLEY.

